Standing majestically by the River Thames, the 5-star Royal Horseguards hotel -- the original home of Scotland Yard and a WWII secret-service base -- is offering a 2-course lunch at its One Twenty One Two restaurant for £15.

Rowley's Restaurant was established in 1977 in a building that was the home of Wall's butchers in the 1830s. You can now visit any day of the week for a chateaubriand steak meal for two for £39 -- saving 49% on the usual price.

The Michelin-starred Mayfair restaurant Galvin at Windows combines culinary excellence with "stunning bird's-eye views" (The AA). You can visit for three courses of "precision-turned food with a view" (The Good Food Guide 2015) and a bellini cocktail for £29 at lunch, or £39 at dinner.